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Difficulty: MediumManaging Storage and Data Transfer Costs

A healthcare provider stores 800 TB800\text{ TB} of patient medical imaging records in an Amazon S3 bucket in the `us-east-1` region. The records are accessed frequently during the first 30 days30\text{ days}. After 30 days30\text{ days}, access drops to less than 1%1\% of the records per month, but the records must be retained indefinitely. When an archived record is requested by a physician, it must be retrieved within 4 hours4\text{ hours}. The provider wants to minimize both storage and data retrieval costs. Which of the following lifecycle policies represents the most cost-effective and architecturally sound configuration?

  1. A
    Transition the objects to Amazon S3 Glacier Instant Retrieval after 30 days30\text{ days}. Use millisecond retrievals when records are requested.
  2. Transition the objects to Amazon S3 Glacier Flexible Retrieval after 30 days30\text{ days}. Use Standard retrieval (3 to 5 hours) when records are requested.Answer
  3. C
    Transition the objects to Amazon S3 Glacier Deep Archive after 30 days30\text{ days}. Use Standard retrieval (12 hours) when records are requested.
  4. D
    Transition the objects to Amazon S3 Glacier Flexible Retrieval after 30 days30\text{ days}. Use Expedited retrieval (1 to 5 minutes) when records are requested.

Answer

Transition the objects to Amazon S3 Glacier Flexible Retrieval after 30 days and use Standard retrieval (3 to 5 hours) when records are requested.
Transitioning to Amazon S3 Glacier Flexible Retrieval and using Standard retrieval is the most cost-effective option. S3 Glacier Flexible Retrieval has lower monthly storage costs than S3 Glacier Instant Retrieval. Standard retrieval (taking 3 to 5 hours) fits within the required 4-hour window, and unlike Expedited retrieval or Instant Retrieval, Standard retrieval carries no data retrieval charge per gigabyte.

Step-by-Step Solution

1
Analyze the retrieval time SLA requirement.
The physician requires access to archived records within 4 hours.
This requirement determines which Amazon S3 storage classes and retrieval tiers can be considered.
2
Evaluate S3 Glacier storage classes and their retrieval times against the 4-hour SLA.
S3 Glacier Deep Archive standard retrieval takes 12 hours (violating the SLA). S3 Glacier Flexible Retrieval standard retrieval takes 3-5 hours (meets the SLA). S3 Glacier Instant Retrieval takes milliseconds (meets the SLA).
Eliminating options that do not meet the recovery time objective prevents compliance failures.
3
Compare storage and retrieval costs of compliant options.
S3 Glacier Flexible Retrieval has lower monthly storage costs than S3 Glacier Instant Retrieval, and its Standard retrieval option has no data retrieval charge. Expedited retrieval on Glacier Flexible Retrieval carries a high cost per GB and is unnecessary.
Selecting the option with the lowest combined storage and retrieval costs satisfies the cost-optimization requirement.

Key Concept

S3 Lifecycle and retrieval cost optimization matching business SLAs
Estimated Time:2m 0s
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Topics

Managing Storage and Data Transfer Costs